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-rw-r--r--examples/chart/chartform_canvas.cpp226
1 files changed, 226 insertions, 0 deletions
diff --git a/examples/chart/chartform_canvas.cpp b/examples/chart/chartform_canvas.cpp
new file mode 100644
index 000000000..842c04e6f
--- /dev/null
+++ b/examples/chart/chartform_canvas.cpp
@@ -0,0 +1,226 @@
+#include "canvastext.h"
+#include "chartform.h"
+
+#include <qbrush.h>
+#include <qcanvas.h>
+
+#include <math.h> // sin, cos
+
+#ifndef M_PI
+#define M_PI 3.1415
+#endif
+
+void ChartForm::drawElements()
+{
+ TQCanvasItemList list = m_canvas->allItems();
+ for ( TQCanvasItemList::iterator it = list.begin(); it != list.end(); ++it )
+ delete *it;
+
+ // 360 * 16 for pies; TQt works with 16ths of degrees
+ int scaleFactor = m_chartType == PIE ? 5760 :
+ m_chartType == VERTICAL_BAR ? m_canvas->height() :
+ m_canvas->width();
+ double biggest = 0.0;
+ int count = 0;
+ double total = 0.0;
+ static double scales[MAX_ELEMENTS];
+
+ for ( int i = 0; i < MAX_ELEMENTS; ++i ) {
+ if ( m_elements[i].isValid() ) {
+ double value = m_elements[i].value();
+ count++;
+ total += value;
+ if ( value > biggest )
+ biggest = value;
+ scales[i] = m_elements[i].value() * scaleFactor;
+ }
+ }
+
+ if ( count ) {
+ // 2nd loop because of total and biggest
+ for ( int i = 0; i < MAX_ELEMENTS; ++i )
+ if ( m_elements[i].isValid() )
+ if ( m_chartType == PIE )
+ scales[i] = (m_elements[i].value() * scaleFactor) / total;
+ else
+ scales[i] = (m_elements[i].value() * scaleFactor) / biggest;
+
+ switch ( m_chartType ) {
+ case PIE:
+ drawPieChart( scales, total, count );
+ break;
+ case VERTICAL_BAR:
+ drawVerticalBarChart( scales, total, count );
+ break;
+ case HORIZONTAL_BAR:
+ drawHorizontalBarChart( scales, total, count );
+ break;
+ }
+ }
+
+ m_canvas->update();
+}
+
+
+void ChartForm::drawPieChart( const double scales[], double total, int )
+{
+ double width = m_canvas->width();
+ double height = m_canvas->height();
+ int size = int(width > height ? height : width);
+ int x = int(width / 2);
+ int y = int(height / 2);
+ int angle = 0;
+
+ for ( int i = 0; i < MAX_ELEMENTS; ++i ) {
+ if ( m_elements[i].isValid() ) {
+ int extent = int(scales[i]);
+ TQCanvasEllipse *arc = new TQCanvasEllipse(
+ size, size, angle, extent, m_canvas );
+ arc->setX( x );
+ arc->setY( y );
+ arc->setZ( 0 );
+ arc->setBrush( TQBrush( m_elements[i].valueColor(),
+ BrushStyle(m_elements[i].valuePattern()) ) );
+ arc->show();
+ angle += extent;
+ TQString label = m_elements[i].label();
+ if ( !label.isEmpty() || m_addValues != NO ) {
+ label = valueLabel( label, m_elements[i].value(), total );
+ CanvasText *text = new CanvasText( i, label, m_font, m_canvas );
+ double proX = m_elements[i].proX( PIE );
+ double proY = m_elements[i].proY( PIE );
+ if ( proX < 0 || proY < 0 ) {
+ // Find the centre of the pie segment
+ TQRect rect = arc->boundingRect();
+ proX = ( rect.width() / 2 ) + rect.x();
+ proY = ( rect.height() / 2 ) + rect.y();
+ // Centre text over the centre of the pie segment
+ rect = text->boundingRect();
+ proX -= ( rect.width() / 2 );
+ proY -= ( rect.height() / 2 );
+ // Make proportional
+ proX /= width;
+ proY /= height;
+ }
+ text->setColor( m_elements[i].labelColor() );
+ text->setX( proX * width );
+ text->setY( proY * height );
+ text->setZ( 1 );
+ text->show();
+ m_elements[i].setProX( PIE, proX );
+ m_elements[i].setProY( PIE, proY );
+ }
+ }
+ }
+}
+
+
+void ChartForm::drawVerticalBarChart(
+ const double scales[], double total, int count )
+{
+ double width = m_canvas->width();
+ double height = m_canvas->height();
+ int prowidth = int(width / count);
+ int x = 0;
+ TQPen pen;
+ pen.setStyle( NoPen );
+
+ for ( int i = 0; i < MAX_ELEMENTS; ++i ) {
+ if ( m_elements[i].isValid() ) {
+ int extent = int(scales[i]);
+ int y = int(height - extent);
+ TQCanvasRectangle *rect = new TQCanvasRectangle(
+ x, y, prowidth, extent, m_canvas );
+ rect->setBrush( TQBrush( m_elements[i].valueColor(),
+ BrushStyle(m_elements[i].valuePattern()) ) );
+ rect->setPen( pen );
+ rect->setZ( 0 );
+ rect->show();
+ TQString label = m_elements[i].label();
+ if ( !label.isEmpty() || m_addValues != NO ) {
+ double proX = m_elements[i].proX( VERTICAL_BAR );
+ double proY = m_elements[i].proY( VERTICAL_BAR );
+ if ( proX < 0 || proY < 0 ) {
+ proX = x / width;
+ proY = y / height;
+ }
+ label = valueLabel( label, m_elements[i].value(), total );
+ CanvasText *text = new CanvasText( i, label, m_font, m_canvas );
+ text->setColor( m_elements[i].labelColor() );
+ text->setX( proX * width );
+ text->setY( proY * height );
+ text->setZ( 1 );
+ text->show();
+ m_elements[i].setProX( VERTICAL_BAR, proX );
+ m_elements[i].setProY( VERTICAL_BAR, proY );
+ }
+ x += prowidth;
+ }
+ }
+}
+
+
+void ChartForm::drawHorizontalBarChart(
+ const double scales[], double total, int count )
+{
+ double width = m_canvas->width();
+ double height = m_canvas->height();
+ int proheight = int(height / count);
+ int y = 0;
+ TQPen pen;
+ pen.setStyle( NoPen );
+
+ for ( int i = 0; i < MAX_ELEMENTS; ++i ) {
+ if ( m_elements[i].isValid() ) {
+ int extent = int(scales[i]);
+ TQCanvasRectangle *rect = new TQCanvasRectangle(
+ 0, y, extent, proheight, m_canvas );
+ rect->setBrush( TQBrush( m_elements[i].valueColor(),
+ BrushStyle(m_elements[i].valuePattern()) ) );
+ rect->setPen( pen );
+ rect->setZ( 0 );
+ rect->show();
+ TQString label = m_elements[i].label();
+ if ( !label.isEmpty() || m_addValues != NO ) {
+ double proX = m_elements[i].proX( HORIZONTAL_BAR );
+ double proY = m_elements[i].proY( HORIZONTAL_BAR );
+ if ( proX < 0 || proY < 0 ) {
+ proX = 0;
+ proY = y / height;
+ }
+ label = valueLabel( label, m_elements[i].value(), total );
+ CanvasText *text = new CanvasText( i, label, m_font, m_canvas );
+ text->setColor( m_elements[i].labelColor() );
+ text->setX( proX * width );
+ text->setY( proY * height );
+ text->setZ( 1 );
+ text->show();
+ m_elements[i].setProX( HORIZONTAL_BAR, proX );
+ m_elements[i].setProY( HORIZONTAL_BAR, proY );
+ }
+ y += proheight;
+ }
+ }
+}
+
+
+TQString ChartForm::valueLabel(
+ const TQString& label, double value, double total )
+{
+ if ( m_addValues == NO )
+ return label;
+
+ TQString newLabel = label;
+ if ( !label.isEmpty() )
+ if ( m_chartType == VERTICAL_BAR )
+ newLabel += '\n';
+ else
+ newLabel += ' ';
+ if ( m_addValues == YES )
+ newLabel += TQString::number( value, 'f', m_decimalPlaces );
+ else if ( m_addValues == AS_PERCENTAGE )
+ newLabel += TQString::number( (value / total) * 100, 'f', m_decimalPlaces )
+ + '%';
+ return newLabel;
+}
+
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